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    <!-- 基本用法 -->
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        your browser does not support the <code>audio</code> element.
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    <audio src="foo.ogg">
        <track kind="captions" src="foo.en.vtt" srclang="en" label="English"/>
        <track kind="captions" src="foo.sv.vtt" srclang="sv" label="Svenska"/>
    </audio>

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        your browser does not support the <code>audio</code> element.
        <source src="foo.wav" type="audio/wav"/>
    </audio>
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